Sound problems after recapping my Turbo Duo

[Valkyrie]

I got a Turbo Duo with sound issues last week.  It sounded fine for about the first 5 minutes, then it started to fade and get crackly.  Not unexpected, since it was never re-capped.
I finished re-capping it today, but it's still having sound issues.  Now, the right channel has decent volume, but it's still crackly.  And I've got nothing at all from the left channel.  But if I plug in headphones, it sound just fine through them on both channels.

I did a pretty good job with the caps.  No lifted pads or anything.  Along the way, I found 3 broken vias, which led underneath IC503.  I removed the chip as carefully as I could and repaired the vias, but I can't be sure I didn't damage the chip with too much heat.

Any advice on where to go from here?  Does this sound like a problem that IC503 could cause?  Or is there something else I should be looking at first?
Thanks!

[bozo55]

I got a Turbo Duo with sound issues last week.  It sounded fine for about the first 5 minutes, then it started to fade and get crackly.  Not unexpected, since it was never re-capped.
I finished re-capping it today, but it's still having sound issues.  Now, the right channel has decent volume, but it's still crackly.  And I've got nothing at all from the left channel.  But if I plug in headphones, it sound just fine through them on both channels.

I did a pretty good job with the caps.  No lifted pads or anything.  Along the way, I found 3 broken vias, which led underneath IC503.  I removed the chip as carefully as I could and repaired the vias, but I can't be sure I didn't damage the chip with too much heat.

Any advice on where to go from here?  Does this sound like a problem that IC503 could cause?  Or is there something else I should be looking at first?
Thanks!

I'm having similar problems as you.  Your best bet will be to remove the 3 op amps IC506, IC521 and IC5xx (the 8 pin op amp beside 521), and clean the areas around them throughly, jumper any corroded vias, and check for continuity between the op amp and areas close by.  I had a bad trace that looked fine.

[kyosuke75]

I got a Turbo Duo with sound issues last week.  It sounded fine for about the first 5 minutes, then it started to fade and get crackly.  Not unexpected, since it was never re-capped.
I finished re-capping it today, but it's still having sound issues.  Now, the right channel has decent volume, but it's still crackly.  And I've got nothing at all from the left channel.  But if I plug in headphones, it sound just fine through them on both channels.

I did a pretty good job with the caps.  No lifted pads or anything.  Along the way, I found 3 broken vias, which led underneath IC503.  I removed the chip as carefully as I could and repaired the vias, but I can't be sure I didn't damage the chip with too much heat.

Any advice on where to go from here?  Does this sound like a problem that IC503 could cause?  Or is there something else I should be looking at first?
Thanks!

I'm having similar problems as you.  Your best bet will be to remove the 3 op amps IC506, IC521 and IC5xx (the 8 pin op amp beside 521), and clean the areas around them throughly, jumper any corroded vias, and check for continuity between the op amp and areas close by.  I had a bad trace that looked fine.

I have the same issue with mine.  A friend of mine recapped it.  Cd audio doesn't work but you get turbo hucard sound and music.  Just no cd audio.  He tweaked the laser on it and everything but he isn't sure what the problem is.

Sent from my SM-N910V using Tapatalk

[bozo55]

I got a Turbo Duo with sound issues last week.  It sounded fine for about the first 5 minutes, then it started to fade and get crackly.  Not unexpected, since it was never re-capped.
I finished re-capping it today, but it's still having sound issues.  Now, the right channel has decent volume, but it's still crackly.  And I've got nothing at all from the left channel.  But if I plug in headphones, it sound just fine through them on both channels.

I did a pretty good job with the caps.  No lifted pads or anything.  Along the way, I found 3 broken vias, which led underneath IC503.  I removed the chip as carefully as I could and repaired the vias, but I can't be sure I didn't damage the chip with too much heat.

Any advice on where to go from here?  Does this sound like a problem that IC503 could cause?  Or is there something else I should be looking at first?
Thanks!

I'm having similar problems as you.  Your best bet will be to remove the 3 op amps IC506, IC521 and IC5xx (the 8 pin op amp beside 521), and clean the areas around them throughly, jumper any corroded vias, and check for continuity between the op amp and areas close by.  I had a bad trace that looked fine.

I have the same issue with mine.  A friend of mine recapped it.  Cd audio doesn't work but you get turbo hucard sound and music.  Just no cd audio.  He tweaked the laser on it and everything but he isn't sure what the problem is.

Sent from my SM-N910V using Tapatalk

The only thing I can suggest is to thoroughly check for continuity in any of the areas where the caps leaked.

[kyosuke75]

I got a Turbo Duo with sound issues last week.  It sounded fine for about the first 5 minutes, then it started to fade and get crackly.  Not unexpected, since it was never re-capped.
I finished re-capping it today, but it's still having sound issues.  Now, the right channel has decent volume, but it's still crackly.  And I've got nothing at all from the left channel.  But if I plug in headphones, it sound just fine through them on both channels.

I did a pretty good job with the caps.  No lifted pads or anything.  Along the way, I found 3 broken vias, which led underneath IC503.  I removed the chip as carefully as I could and repaired the vias, but I can't be sure I didn't damage the chip with too much heat.

Any advice on where to go from here?  Does this sound like a problem that IC503 could cause?  Or is there something else I should be looking at first?
Thanks!

I'm having similar problems as you.  Your best bet will be to remove the 3 op amps IC506, IC521 and IC5xx (the 8 pin op amp beside 521), and clean the areas around them throughly, jumper any corroded vias, and check for continuity between the op amp and areas close by.  I had a bad trace that looked fine.

I have the same issue with mine.  A friend of mine recapped it.  Cd audio doesn't work but you get turbo hucard sound and music.  Just no cd audio.  He tweaked the laser on it and everything but he isn't sure what the problem is.

Sent from my SM-N910V using Tapatalk

The only thing I can suggest is to thoroughly check for continuity in any of the areas where the caps leaked.

Cool thanks.  My friend is looking tonight for any bad traces, etc

Sent from my SM-N910V using Tapatalk

[Brraap]

Remove all caps + the super cap and wash the entire board. old cap juice under the opt amps can cause this

[thesteve]

no need to remove the caps first

[wilykat]

^^ this.  New non-fake caps are properly sealed and shouldn't suffer from water damage.

[wilykat]

double post

[mario_pic]

Sorry about hijacking the thread I got same problem with my duo as well swapped out every cap I get crackling in sound   I cleaned under ic506   should I lift and clean ic507  ic521 and ic503 I also get same sound crackling from the headphone jack  is there a diagram of the audio circuit 

[bozo55]

Sorry about hijacking the thread I got same problem with my duo as well swapped out every cap I get crackling in sound   I cleaned under ic506   should I lift and clean ic507  ic521 and ic503 I also get same sound crackling from the headphone jack  is there a diagram of the audio circuit

If you solve this problem let me know what you did to fix it.  I'm getting the static out of the right channel only and haven't made the time to clean under every op amp yet.

[BlueBMW]

Check out this thread here...

http://www.pcenginefx.com/forums/index.php?topic=17498.msg365761#msg365761

At some point you'll have to just go through the sound circuit piece by piece until you find the spot where something isn't working.  I know I've had grounds go bad due to corroded vias and as a result the op amp or whatever that used the ground wouldn't function and sound would go in but not come out of the chip.  Build a little probe like described there and starting working your way through the sound circuit.

[Keith Courage]

Sometimes if you hear crackling you can get lucky by just leaving the system turned on for a long time. Meaning, maybe after 12 hours or so the short will sometimes go bad all the way making it much more easy to find the shorted out/bad part in the circuit. Every system that I recap I leave turned on over night to make sure no bad traces/shorted sections show up. That old cap goop can really get into things sometimes.

[mario_pic]

Sometimes if you hear crackling you can get lucky by just leaving the system turned on for a long time. Meaning, maybe after 12 hours or so the short will sometimes go bad all the way making it much more easy to find the shorted out/bad part in the circuit. Every system that I recap I leave turned on over night to make sure no bad traces/shorted sections show up. That old cap goop can really get into things sometimes.

let my unit run for 12 hr playing audio loop still the same nothing changed any info on what points on the ic I could tap for sound

[thesteve]

its likely an open via by the heatsinks and the 10UF caps